Times when question «What candles to buy have sunk into the past?» It was irrelevant and it was possible to get only domestic and only that model, as on the car. Now on counters a huge choice of candles almost all foreign manufacturers. And, naturally, «самопальщики» have there and then started them to forge.
Not to buy such candles, first of all pay attention to packing – quality of polygraphy at the present manufacturers faultlessly, and at counterfeit contours of drawings often do not coincide. If packing is not present in general, the further survey of candles is not meaningful – firm candles without it do not happen. Then examine candles.
The central electrode should have the accurate cylindrical form, and its surface should be absolutely smooth. If on an electrode there are defects and the more so it is crookedly established – before you a fake. The lateral electrode at a counterfeit candle often too is welded crookedly, and its sides slanting. At firm candles a carving make накаткой, therefore it absolutely smooth. At counterfeit it is cut and has small сколы. It is impossible to remove a sealing ring of the present candle. At counterfeit it or is screwed together on a carving, or easily acts in film. An insulator of the present candle absolutely smooth and shining. At counterfeit longitudinal seams are often visible from is inexact the joined compression mould. And, at last, the inscription on an insulator should be accurate, equal and accurate. And the last – the present firm candles cannot be cheap.
Too low price should guard you.
Sometimes at intensive dispersal with engine "promotion" almost to the maximum turns there are the sharp jerks perceived as blows. Spark plugs though check пьезотестером ("pistol") speaks about their serviceability are guilty.
The reason in that candles lose in due course tightness and normally working at small and average loadings a candle at a high pressure in combustion chambers gives ignition admissions. Therefore it is not recommended to maintain a candle without replacement of more 15 thousand in km.